| CPC E05B 85/26 (2013.01) [E05B 85/243 (2013.01)] | 9 Claims |
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1. A door latch device comprising:
a latching mechanism configured to engage with and disengage from a striker, the latching mechanism including an operation receiving portion that receives an operation for releasing an engagement with the striker;
an open lever configured to rotate in conjunction with an operation of a door handle;
a link configured to advance and retreat along a first direction between an advanced position moved toward the operation receiving portion by receiving a rotational force of the open lever and a retreated position separated from the operation receiving portion, and configured to swing along a second direction intersecting the first direction between an unlock position where a rotational force of the open lever is configured to be transmitted to the operation receiving portion and a lock position where a rotational force of the open lever is not configured to be transmitted to the operation receiving portion;
a spring member configured to bias the link from the lock position toward the unlock position and to allow swinging of the link from the unlock position toward the lock position when an inertial force equal to or greater than a set value acts on the link; and
a restricting portion configured to lock the spring member when the link swings toward the lock position against the biasing force of the spring member due to an action of the inertial force equal to or greater than the set value, the restricting portion configured to restrict swinging of the link toward the unlock position by the spring member, wherein
the link includes a restriction release portion that moves at least a part of the spring member to release locking to the restricting portion and to release swinging restriction of the link when swinging is restricted by the restricting portion and the link is moved from the retreated position to the advanced position by receiving a rotational force of the open lever,
the spring member is disposed in a lock lever configured to move,
the link is configured to swing in conjunction with movement of the lock lever through the spring member, and when the link is swinging-restricted by the restricting portion, the link is positioned at a restriction position where a rotational force of the open lever is not transmitted to the operation receiving portion,
the link includes a coupled portion provided with a guide groove extending along the first direction, and
the spring member includes:
a locked portion configured to engage with and disengage from the restricting portion by a movement in a third direction intersecting both the first direction and the second direction;
a receiving portion positioned on a movement track of the restriction release portion when the link at the restriction position moves from the retreated position to the advanced position, the receiving portion being moved in the third direction by the restriction release portion to allow the locked portion to be separated from the restricting portion; and
an insertion portion inserted into the guide groove to allow advance and retreat along the first direction of the link.
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